/Engine/Source/Runtime/Engine/Public/Elements/SMInstance/SMInstanceElementId.h
Called when one ISM component is replaced with another, and attempts to copy the ID mapping of the old component to the new.
void OnComponentReplaced ( [UInstancedStaticMeshComponent](API\Runtime\Engine\Components\UInstancedStaticMeshComponent) * InOldComponent, [UInstancedStaticMeshComponent](API\Runtime\Engine\Components\UInstancedStaticMeshComponent) * InNewComponent )